Mark posted a paired down version of Crownrend on his Twitter some months ago, but I don't think an official writeup on the Shroud has been released. That said, I think just about everything it does was shown/read on stream, but I could be wrong

Monks regain ALL of their spent ki points on a short rest. Assuming your players are taking short rests, ki shouldn't be in any more demand than any other class resource. That said, if you do give your player that magic item, you'll just have to account for it in further encounters.